Talk to her, she will tell you a little about the Sa-mhing Tiger. Tell her you want to explore the ancient ruins. She will ask you to bring her some items in order to make an object to protect you in the ruins. So just hunt the items and get back to her.

You can get the holy water from priests or acolytes. The other items are common drops from niflheim and umbala dungeon monsters.

Ayothaya Dungeon Quest - Step 3 :: Access to Level 1

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Exit Ayothaya from the east walk straight to get to the edge of the dark area

On the field, head for the dungeon entrance. Once you are in there, just facing the entrance there are 3 paths to the north and 3 paths to the west. Take the Left most path of the 3 north paths (marked with a green rectangle and the 'start' letters on the map below). Once you start on that path, an npc window will appear. It will show 6 marks on your minimap screen, you have to get to all 6 marked points in the order marked by the map below. Once you read all messages on all 6 stone slates, you can get back to Boonthom.

Becareful of the holes located at the 4 corners of the map, you can fall into them and die from it.

So you are back to her with the messages you gathered in level 1 of the dungeon. You show them to her and she will ask you for some items in order to make you the Holier Threads. You will need the Holier Threads which contain even more holy protection in order to enter the 2nd floor of the dungeon.